Its a 4 speed sm420, the 2 speed rear end I don't know if it works, its the next part im gonna tackle. it wasn't a original v8 someone put the badges on when they restored it in that early 80s, so the floors are pretty good and that one big hole above the windshield is where that speaker was but there are some smaller ones that i have just been ignoring, the only good thing about those holes is that i can hide my key up there!